<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      //   var obj = { name: "张三", age: 20 };
      //   function copy(arg) {
      //     var newArg = Array.isArray(arg) ? [] : {};
      //     for (var key in arg) {
      //       newArg[key] = arg[key];
      //       return newArg;
      //     }
      //   }
      //   var obj2 = copy(obj);
      //   obj2.age = 30;
      //   console.log(obj);

      // 深拷贝
      function deepCopy(arg)
    </script>
  </body>
</html>
